Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 588 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B0083 OR B0084CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
- Front impact sensor
- SDM
- Front impact sensor wiring harness connector
- SDM wiring harness connector
- Ignition OFF, disconnect the harness connector at the applicable front impact sensor and the harness connector at the SDM.
- Test for infinite resistance between the applicable impact sensor signal circuit terminal B (left) or terminal A (right) and ground.
- If less than the specified value, test the circuit for a short to ground.
- Ignition ON, test for less than 1 volt between the applicable impact sensor signal circuit terminal B (left) or terminal A (right) and ground.
- If greater than the specified range, test the circuit for a short to voltage.
- Ignition ON, test for less than 1 volt between the applicable impact sensor low reference circuit terminal A (left) or terminal B (right) and ground.
- If greater than the specified range, test the circuit for a short to voltage.
- Ignition ON, test for less than 1 volt between the low reference circuit terminal A (left) or terminal B (right) and ground.
- If greater than the specified range, test the low reference circuit for a short to voltage.
- Test for less then 5 ohms between the appropriate signal circuit terminals listed below:
- Left front impact sensor terminal Band SDM terminal 38
- Right front impact sensor terminal A and SDM terminal 36
- If greater than the specified range, test the signal circuit for an open/high resistance.
- Test for less then 5 ohms between the appropriate low control circuit terminals listed below:
- Left front impact sensor terminal A and SDM terminal 39
- Right front impact sensor terminal B and SDM terminal 37
- If greater than the specified range, test the control circuit for an open/high resistance.
- If all circuits test normal, replace the appropriate impact sensor.
- Clear DTCs and cycle the ignition OFF then ON. Verify the DTC B0083 or B0084 is not set.
- If the DTC sets, replace the SDM.
IMPORTANT:
When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.